It's been 8+ years since I last used Ubuntu on my laptop. I faced massive issues with staying on the latest version of Firefox because apt had a much older version, and installing using the gui installer wouldn't replace the apt version etc etc. Probably a PEBKAC issue...
But, I do want to know- is this not an issue any more? Will apt install the latest (or almost latest) version of Firefox? Can I update it from the inbuilt update tool in Firefox?